Radiation Detector Scintillator Light-Reflecting Layers
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In multi-channel array radiation detectors for radiation CT devices, the small size of radiation detecting elements and narrow gaps between scintillator elements make it difficult to accurately assemble radiation shielding plates and maintain high-definition image quality due to light attenuation and radiation cross-talk.
Innovation Solution
A radiation detector structure with thin, precisely controlled light-reflecting material layers on the scintillator elements and a radiation shielding material layer composed of resin blended with heavy metal particles, which are strategically placed between adjacent light-reflecting material layers to minimize radiation leakage and enhance detection efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a thick light-reflecting material layer is used to prevent light attenuation, then light reflectivity is improved, but the radiation shielding plate must be placed farther from the scintillator element side surface, allowing low-angle radiation to pass through and reducing manufacturing precision
Solution Approach 1:
The patent uses a composite light-reflecting material consisting of white pigment particles (such as titanium oxide) dispersed in a transparent resin. This composite structure provides high light reflectivity while maintaining a thin layer thickness, enabling the radiation shielding plate to be positioned close to the scintillator element for precise assembly and effective low-angle radiation shielding.
2Productivity
If the gap between scintillator elements is reduced to increase detection elements, then productivity is improved, but it becomes difficult to interpose radiation shielding plates between light-reflecting materials, worsening manufacturing precision
Solution Approach 1:
The patent employs a thin film light-reflecting material layer that can be applied directly to the scintillator element surface. This thin film structure allows the radiation shielding plate to be positioned immediately adjacent to the scintillator element even when gaps are narrow, enabling precise assembly and maintaining manufacturing precision while accommodating high-density multi-channel array configurations.
3Illumination intensity
If white pigment with high light-reflectivity is used to compensate for light attenuation, then light reflectivity is improved, but the light-reflecting material becomes thicker, increasing device complexity
Solution Approach 1:
The patent utilizes a composite light-reflecting material where white pigment particles (such as titanium oxide) are dispersed in a transparent resin matrix. This composite formulation achieves high light reflectivity (around 90% or higher) in a thin layer configuration, avoiding the need for thick material layers and thereby reducing overall device complexity while maintaining effective light reflection for sensitivity compensation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively reduces radiation cross-talk and low-angle radiation incidence, enabling high-definition and high-resolution images by precisely controlling the thickness of light-reflecting and radiation shielding material layers, ensuring accurate assembly and improved sensitivity.
Implementation Method 1
a scintillator element of each radiation detecting element
Implementation Method 2
it is necessary to dispose a light-reflecting material having high light-reflectivity to the side surfaces of the scintillator element
Implementation Method 3
a radiation shielding plate made of heavy metal element, such as tungsten or lead, is interposed between the scintillator elements to prevent cross-talk
Data Source
AI summary
Disclosed is a multi-channel array radiation detector that can provide high-definition and high-resolution CT photo-images. The radiation detector has semiconductor photo-detecting elements arranged lengthwise and breadth-wise in a lattice manner and scintillator elements arranged on them one-to-one. The scintillator elements have thin metal light-reflecting material layers formed on side surfaces of the scintillator elements, and a radiation shielding material layer composed of resin blended with heavy metal element particles is filled in between adjacent metal light-reflecting material layers.